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Official Hello technology account, sharing tech insights and developments.

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HelloTech

Mar 28, 2022 · Artificial Intelligence

Algorithmic Optimization for Information Flow Advertising at Hello Travel

Hello Travel tackles information‑flow advertising challenges by using LightGBM‑based models to predict order conversion, creative performance, and pre‑bid user quality, augmenting sparse data with feature engineering and uplift techniques, while planning future fully automated delivery, richer pre‑screening, and cross‑channel reinforcement‑learning enhancements.

AdvertisingAlgorithm OptimizationLightGBM

0 likes · 18 min read

Algorithmic Optimization for Information Flow Advertising at Hello Travel

HelloTech

Mar 1, 2022 · Artificial Intelligence

Causal Inference and Tree‑Based Uplift Modeling for Intelligent Subsidy in Ride‑Sharing Services

The paper applies causal inference and tree‑based uplift modeling to identify coupon‑responsive riders, using T‑, S‑, and X‑Learners as well as a proprietary Treelift model that directly optimizes per‑user utility, achieving a 4.7% lift over manual rules and 2.3% over prior response models.

AIMarketing OptimizationUplift Modeling

0 likes · 17 min read

Causal Inference and Tree‑Based Uplift Modeling for Intelligent Subsidy in Ride‑Sharing Services

HelloTech

Feb 21, 2022 · Databases

Database Sharding: Partitioning Strategies, Consistent Hashing, SQL Rewrite, and Merge Engine

Database sharding improves performance by partitioning tables vertically or horizontally and routing rows with consistent hashing, while ShardingJDBC rewrites SQL for physical tables, adds missing columns, corrects pagination, splits batch inserts, and merges results using sorting, grouping, aggregation, and pagination engines.

MERGE engineSQL RewriteVertical Partitioning

0 likes · 15 min read

Database Sharding: Partitioning Strategies, Consistent Hashing, SQL Rewrite, and Merge Engine

HelloTech

Feb 10, 2022 · Operations

Elasticsearch Allocation Deciders: Overview, Configuration, and Core Algorithms

Elasticsearch’s AllocationDecider abstract class powers dynamic shard placement, with concrete deciders—such as awareness, rebalance, disk‑threshold, filter, version, and snapshot—controlling node selection, replication, and movement, while the AllocationService and its default BalancedShardsAllocator use weighted balance formulas to allocate, relocate, and rebalance shards whenever index changes, settings updates, or cluster state transitions occur.

AllocationDeciderClusterManagementConfiguration

0 likes · 12 min read

Elasticsearch Allocation Deciders: Overview, Configuration, and Core Algorithms

HelloTech

Jan 25, 2022 · Frontend Development

Introduction and Practice of Web Components and Shadow DOM

The article explains Web Components and their three core technologies—Template, Shadow DOM for CSS isolation, and Custom Elements—demonstrates building a dynamic HTML5 video component with lifecycle callbacks, and discusses use cases such as component libraries, cross‑platform development, micro‑frontends, and the feature‑rich Quark library.

Component ArchitectureFront‑EndShadow DOM

0 likes · 5 min read

Introduction and Practice of Web Components and Shadow DOM

HelloTech

Jan 19, 2022 · Fundamentals

Understanding Mid‑Platform Architecture: Concepts, Benefits, and Implementation Patterns

The article explains mid‑platform architecture as an organizational and technical strategy that abstracts reusable components, defines business identities for isolated yet flexible capabilities, and offers three extension patterns—local JAR integration, remote SPI calls, and shared JARs—to balance performance, isolation, and version management while enabling rapid business line onboarding and scalable growth.

ArchitectureExtension PointsSystem Integration

0 likes · 8 min read

Understanding Mid‑Platform Architecture: Concepts, Benefits, and Implementation Patterns

HelloTech

Jan 6, 2022 · Artificial Intelligence

Green and Smart: The Future of Two-Wheel Transportation and AIoT Opportunities

In his WIM2021 keynote, HelloBike Vice President Liu Xingliang outlined the company’s low‑carbon vision for two‑wheel mobility—spanning bicycles, e‑bikes and electric scooters—by emphasizing reduction, reuse and recycling, while showcasing an AIoT platform that leverages digital manufacturing, smart dispatch, battery‑swap networks and advanced features such as AI fault diagnosis, voice interaction and assisted driving to deliver greener, more efficient urban transport.

AIoTCarbon NeutralityIntelligent Operations

0 likes · 7 min read

Green and Smart: The Future of Two-Wheel Transportation and AIoT Opportunities

HelloTech

Jan 6, 2022 · Mobile Development

Optimizing Real-Time Vehicle Positioning in Ride-Hailing Apps

The article proposes a comprehensive method to eliminate driver‑location flicker and angle errors in ride‑hailing apps by calculating point‑to‑path distances, mapping and inserting points for smooth motion, handling yaw scenarios, refreshing at 12 Hz, correcting vehicle heading, and optimizing animation versus static map scenes.

Ride HailingUser Experiencemap optimization

0 likes · 10 min read

Optimizing Real-Time Vehicle Positioning in Ride-Hailing Apps

HelloTech

Dec 20, 2021 · Big Data

IoT-Enabled Two-Wheeled Vehicles Driving Smart Urban Growth: Insights from the 16th Tsinghua Public Management Forum

By equipping billions of bicycles and e‑bikes with IoT sensors, Hello Mobility creates a city‑wide data platform that boosts travel convenience, safety, environmental sustainability, equitable access, and orderly parking, while supporting China’s low‑carbon goals and tackling fire, accident, standards, utilization, and parking challenges through smart design, shared‑ownership, swap‑charging networks, and geofencing.

IoTSmart CityUrban Governance

0 likes · 9 min read

IoT-Enabled Two-Wheeled Vehicles Driving Smart Urban Growth: Insights from the 16th Tsinghua Public Management Forum

HelloTech

Dec 20, 2021 · Big Data

Building an ElasticSearch-based Search Platform for Ride-Hailing: Architecture, Data Synchronization, and Performance Optimization

Hello Mobility unified its fragmented ElasticSearch clusters into a single, real‑time search platform—leveraging Kafka‑driven CDC, Flink stream processing, custom ES plugins, and extensive performance tuning—to deliver scalable matching, recommendation and voice services, ultimately raising completed orders by 49.8 % and driver acceptance by 37 %.

Data SynchronizationFlinkSearch Platform

0 likes · 19 min read